Berkovich, Yakov and Janko, Zvonimir. "Research problems and themes III". Volume 3, Berlin, Boston: De Gruyter, 2011, pp. 536-629. https://doi.org/10.1515/9783110254488-074
Berkovich, Y. & Janko, Z. (2011). Research problems and themes III. In Volume 3 (pp. 536-629). Berlin, Boston: De Gruyter. https://doi.org/10.1515/9783110254488-074
Berkovich, Yakov and Janko, Zvonimir. "Research problems and themes III" In Volume 3, 536-629. Berlin, Boston: De Gruyter, 2011. https://doi.org/10.1515/9783110254488-074